中川花岗岩构造岩浆活动特征与成矿作用     

宋忠宝  冯益民  何世平 《地球科学与环境学报》1997,(4)

中川花岗岩在空间上呈同心圆环状分布，由三个单元组成，三个单元之间，岩石矿物学、地球化学成分作有规律性地变化，这种变化与圈层结构变化相适应。构造岩浆演化具有同源性，连续性、脉动性；岩体上升侵位方式为具有多次脉动性的复式气球膨胀体；在空间上与金、铀关系密切，但为成金仅提供热源，而为成铀既提供物源，又提供热源。  相似文献   

中川岩体和柴家庄岩体周边金矿的显微特征及其找矿意义     

何世平  宋忠宝  冯益民 《河南国土资源》1995,(2)

本文将北秦岭西段金矿床（点）划分为断裂蚀变岩型和石英脉型。分别从矿石组构、矿物组合、金银矿物的赋存状态、载金矿物、成矿作用、矿物的生成顺序等方面论述它们的特征。并提出本区的斑点板岩、综合地球化学异常区的次级断裂及韧性剪切带、煌斑岩脉、矿石组构、矿物组合及围岩蚀变等为寻找金矿的重要标志。  相似文献   

天体周日视运动过程中天体高度的变化率     

毕修颖  崔照明 《广东海洋大学学报》2006,26(1):49-52

天体周日视运动过程中天体的高度不断变化，对天体观测的质量有直接的影响，通过分析天体周日视运动过程中天体高度的变化率，给出不同观测时机进行天体高度观测的特性，并用曲线图的形式给出天体高度变化率的极值点和零值点。航海人员可以从更深的层次认识天体周日视运动的规律，指导天文定位过程中对天体高度的观测。  相似文献   

QUANTITATIVE MODELING OF SUSPENDED SEDIMENT IN MIDDLE CHANGJIANG RIVER FROM MODIS     

LIU Can-de HE Bao-yin LI Mao-tian REN Xian-you 《中国地理科学(英文版)》2006,16(1):79-82

1INTRODUCTIONThe quality of water is traditionally determined by col-lectingwatersamplesandanalyzingthesamplesin a lab-oratory. However, sampling is very much hard sledding,time-consuming, slow and expensive, and easily in thecontrol of weather conditions, and does not include allwater areas. Satellite estimates of water quality havefound widespread application. Remote sensing instru-ments have been applied in water quality monitoringwith varying success (DANA and RICHARD, 1999;RUDD…  相似文献   

一种基于自适应麦克风阵的智能天线实验平台     

全太锋  牟颖  何小海  朱林 《成都信息工程学院学报》2006,21(3):418-422

智能天线是第三代移动通信的关键技术之一,也是当前信号处理和通信领域的研究热点.在对智能天线算法进行理论分析和仿真的基础上,有必要构建一个灵活、通用的实验平台,用以验证各种智能天线算法的有效性和实用性.探讨了一种基于自适应麦克风阵的智能天线实验平台的实现方法,介绍了该系统的原理、结构和各部分的作用.  相似文献   

A study on element-stratigraphy of Okinawa Trough     

Zhao Yiyang  Qin Zhaoyang  Li Fengye  He Lijuan  Wang Jintu 《中国海洋湖沼学报》1988,6(2):145-156

Regular distribution patterns of elements Ca, Sr, K, Na, Mg, Fe, Mn, Ti, Cu, Co, Ni, Zn, Pb, Cr, Rb, Ba, Cd, and U in Late Quaternary strata have been studied in detail. The regional variation patterns of elements in these strata are similar to those in recent surface sediments, showing that the sedimentary environment has been relatively stable since Late Quaternary. Element distribution changes with the variations of lithological characters. Contents of Ca and Sr increase in coarse sediments, while those of other elements decrease. Na content increases in the pumice layer. Mn, content tends to increase sharply towards the surface layer. Ca content decreases sharply in strata where water depth is more than 2,000 m. The strata can be divided based on the distribution curves of element assemblages. The variations in contents of most elements in Holocene Series are smaller than those in Late Pleistocene Series, which might be related to the factors of glacial and interglacial changes, sea level fluctuations and material source differences. Contribution No. 1488 from Institute of Oceanology, Academia Sinica  相似文献   

北京风沙若干问题的讨论     

陈广庭  贺大良  宋锦熙  关有志 《地理研究》1988,7(3):17-26

本文在实地调查研究的基础上提出对北京风沙一些问题的看法:1)北京风沙物质来源为本地超沙,尘的来源复杂,以外来成分最多;2)分析35午风沙资料得出这些年北京平原风沙趋于成少。  相似文献   

THERMAL EFFECTS OF BUILDING＇S EXTERNAL SURFACES IN CITY——Characteristics of Heat Flux into and out of External Wall Surfaces     

ZHANGYi-ping HEYun-ling LIUYu-hong MAYou-xin LIYou-rong DOUJun-xia 《中国地理科学(英文版)》2004,14(4):343-349

This study examined the thermal effects of building‘s external wall surfaces, using observational data of spatial-temporal distribution of surface temperature, air temperature, and heat flux into and out of external surface. Results indicate that external wall surface temperature and nearby air temperature vary with the change of orientation, height and season. In general, the external wall surface temperature is lower near the ground, and is higher near the roof, than nearby air temperature. But north wall surface temperature is mostly lower than nearby air temperature at the same height; south wall surface temperature during the daytime in December, and west wall surface temperature all day in August, is respectively higher than nearby air temperature. The heat fluxes into and out of external wall surfaces show the differences that exist in the various orientations, heights and seasons. In December,south wall surface at the lower sites emits heat and north wall surface at the higher sites absorbs heat. In April, all external wall surfaces, emit heat near the ground and absorb heat near the roof. In August, west wall surface all day emits heat, and other wall surfaces just show the commensurate behavior with that in April.  相似文献   

农田生态系统中重金属的积累积循环     

穆从如  夏增祿  李森照  孟维奇  沈瑞珍  何瑞珍 《地理研究》1986,5(3):76-81

本文通过对北京东郊高碑店地区污染农田的调查研究,探讨了重金属在农田生态系统中的积累和循环,计算出重金属在区域环境中的输入输出量,说明本区仍处于重金属积累状态,为防治农田环境污染,提出了停止施用污水处理厂的晾干污泥,减少灌溉污水中的重金属含量等保护性措施。  相似文献   

疏散星团M11的维里质量     

赵君亮  何燕萍 《中国天文和天体物理学报》1987,(4)

对疏散星团进行统计研究时,场星的混淆可能是一个严重问题,必须认真对待。本文详细讨论了在估算疏散星团维里(Virial)质量时,正确利用成员概率的重要性。分析表明,只有利用大概率的成员星才能得到合理的星团Virial质量。重新计算后M11的Virial质量为5094μ_⊙,与直接观测到的光度质量的最新结果(4671μ_⊙)符合得很好,维里系数为0.9。  相似文献